The software allows you to view repair PST file without data loss your repaired files and confirm before saving them. Confirm and click on "OK." Select the location where you want to save the file. Once the file is selected, now click on the "Repair" and begin the repair process. If you want to stop the repair process, click on the "Stop" button.

Solution 4: Disable Antivirus and Firewall Temporarily

This blog talks about the causes behind Outlook synchronization errors and a few solutions to fix Outlook sync issues. We have shared five manual methods in this blog to resolve the Outlook syncing errors. FixTechGuide Windows Update Outlook fix Apart from this, we also discuss the Shoviv OST to PST Converter Tool, a professional way to repair, recover, and convert Outlook data files. This solution will be beneficial for users who are facing Outlook syncing issues because of corrupted PST or OST files.

Solution 7: Create a New Profile

While synchronizing your Outlook with the Exchange server, sometimes you receive error messages. It leads to the occurrence of the issues of Outlook OST synchronization. In such scenarios, you need to check the proper working of the synchronization process. After rebuilding the Outlook data file (OST), you must check for any missing mailbox items. After the conversion, you can import the PST into your newly created Outlook account via the Import Export wizard. The software can also directly export the OST file data to an existing Outlook profile, live Exchange Server, or Microsoft 365.

Solution 8: Rebuild Outlook Data File (OST)

After you make this change, none of the shared folders in the secondary mailbox will be available to you in Outlook when you're working offline. However, all folders in the primary mailbox will still be available to you when you're working offline. Conflicts with antivirus Fix Outlook and Office 365 Errors 2025 software or firewall can impact Outlook's synchronization process. You can temporarily turn off your antivirus software and firewall.

Solution 1: Update the Outlook Application

In the main interface, you need to click on "Select PSF/OST file to repair" to upload the required file.

• As PST files are bigger and so chances of the getting corrupted are high.
• All these scenarios indicate problems with the synchronization folder or corrupted .ost file.
• If you are still facing this issue, kindly follow the solutions below to fix the sync issues in Outlook.
• Each of these registered folders counts toward the objtFolder type limit on the server that's running Exchange Server.
• After these instructions, ensure the sync settings are correct and check everything is working well.
• After the conversion, you can import the PST into your newly created Outlook account via the Import Export wizard.

If you see any mismatch in the data, then the methods discussed in this guide will surely help you resolve the issue. When you add other mailboxes to your Outlook profile and enable caching of the shared mailbox folders, Outlook individually registers every folder in each cached mailbox. Each of these registered folders counts toward the objtFolder type limit on the server that's running Exchange Server. Items and logs not synced to your email by Microsoft Outlook are present in the synchronization issues folders.



There can be several reasons for the Outlook synchronization error. Before we know the solutions, we will understand a few common causes of the Outlook sync problem. If disabling the software resolves the issue, then change your antivirus and firewall settings and add Outlook as an exception. Use the OST Integrity Check Tool (Scanost.exe) to check your .ost file for inconsistencies.